DOORS(4)

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Functional Description
Door seals are flexible materials that fill the spaces between
mechanical parts. They are resilient materials that work by
elastic deformation.
Training Information Point
Liquid soap is a good, nonstaining lubricant for most seals. A
lubricant can be useful for these reasons:
* To make installation easy
* To extend the service life of the seal.
A door that is noisy or makes a whistle sound may have a faulty
seal.
You can repair a seal if there is not too much damage.
DOORS - STANDARD DOOR SEALS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DOORS - STANDARD DOOR SEALS
DOORS - STANDARD DOOR SEALS
EFFECTIVITY
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Location
The forward entry door is on the left side of the upper, forward
fuselage.
General Description
The forward entry door is the largest passenger entry door on
the airplane.
The door is a plug-type door. The door has these parts:
* Center door assembly
* Upper gate
* Lower gate.
A liner covers the interior surface of the door.
The center door assembly has hard points at the bottom for the
emergency escape slide installation.
The center door assembly has a window.
Door Control Mechanisms
You can open and close the door from the interior or exterior of
the airplane. You operate the door manually. Unlatch the door
with the control handle.
When you turn the handle in the OPEN direction, internal
mechanisms do these things:
* Disengage the door roller latches
* Fold the door gates inward
* Tilt the door hinge edge inward to the cocked position.
Then push the door through the door frame until it is fully open.
Use the assist handles for this operation.
A lock mechanism in the upper hinge locks the door in the fully
open position.
To close the door, first release the hinge lock and then do the
open operations in reverse order.
A guide pin on the door and a guide pin track on the door frame
align the door in the door frame as it closes.
Door Support
When the airplane is unpressurized, the hinges support the
door.
When the airplane is pressurized, cabin pressure pushes the
door slightly outboard. This causes these things to occur:
* Door seals compress
* Door stop pins contact frame stop fittings. This transmits the
door pressure loads to the door frame structure
DOORS - PASSENGER/CREW - INTRODUCTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-001
* Door latches are unloaded.
Door Seals
The door has these seals:
* Edge seals (flap and bulb type)
* Gate hinge seals (diaphragm type).
Door Drains
The door structure has internal drain paths. The door sections
drain into the door frame threshold. The door threshold drains
overboard through a bladder in the lower fuselage.
Door Warning
The forward entry door has an interface with the door warning
system. There is a proximity switch assembly on the door frame
adjacent to an upper latch track. The switch senses the position
of the door latch roller. When the door is latched, it causes the
P5 panel warning light to go off.
An orange pennant is on the door liner above the window.
Manually secure it across the window when the door escape
slide is armed. This is a visual indication to someone outside
the airplane that the door slide is armed.
DOORS - PASSENGER/CREW - INTRODUCTION
EFFECTIVITY
GUN ALL 52-10-00
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-001
DOORS - PASSENGER/CREW - INTRODUCTION
DOORS - PASSENGER/CREW - INTRODUCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-001
DOORS - PASSENGER/CREW - INTRODUCTION
DOORS - PASSENGER/CREW - INTRODUCTION
EFFECTIVITY
GUN 201-999 52-10-00
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